package exercise;

import JZOffer.ListNode;

public class LC21 {
    public ListNode mergeTwoLists(ListNode list1, ListNode list2) {
        ListNode node = new ListNode();
        ListNode cur = node;

        while (list1 != null && list2 != null) {
            if (list1.val < list2.val) {
                cur.next = list1;
                list1 = list1.next;
            } else {
                cur.next = list2;
                list2 = list2.next;
            }
            cur = cur.next;
        }

        if (list1 != null) {
            cur.next = list1;
        } else {
            cur.next = list2;
        }
        return node.next;
    }

    public static void main(String[] args) {
        ListNode l1 = new ListNode(1);
        l1.next = new ListNode(2);
        l1.next.next = new ListNode(4);

        ListNode l2 = new ListNode(1);
        l2.next = new ListNode(3);
        l2.next.next = new ListNode(4);

        LC21 lc21 = new LC21();
        ListNode node = lc21.mergeTwoLists(l1, l2);

    }
}
